Symptom
Engine won't
Insufficient
start or output is
compression
low
No fuel to
combustion
chamber
Spark plugs
fouled by fuel
No spark or
weak spark
Probably Cause
Loose spark plugs
Loose cylinder head bolts
Faulty pistons, cylinders, piston rings,
or head gaskets
Faulty valves
No fuel in fuel tank
Fuel valve not in "ON" position
Blocked fuel filter or tube
Blocked air vent in tank cap
Faulty carburetor
Clogged air cleaner
Incorrect grade/type of fuel
Water in fuel
Over rich fuel/air mixture
Faulty carburetor
Faulty spark plugs
Engine switch left in "OFF" position
Faulty ignition coil
TROUBLESHOOTING GUIDE
Remedy
Tighten properly
◊
Fill fuel tank
Open fuel valve lever.
Change fuel filter or fuel tube
Clean fuel tank cap
◊
Clean
Change fuel
Open choke.
◊
◊
Replace spark plugs
Turn engine switch to "START"
position (See ◊)
◊
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